Get all EBS Snapshots associated with the current credentials.

        :type snapshot_ids: list
        :param snapshot_ids: Optional list of snapshot ids.  If this list is
                             present, only the Snapshots associated with
                             these snapshot ids will be returned.

        :type owner: str
        :param owner: If present, only the snapshots owned by the specified user
                      will be returned.  Valid values are:

                      * self
                      * amazon
                      * AWS Account ID

        :type restorable_by: str
        :param restorable_by: If present, only the snapshots that are restorable
                              by the specified account id will be returned.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

        :rtype: list of :class:`boto.ec2.snapshot.Snapshot`
        :return: The requested Snapshot objects

def get_all_snapshots(self, snapshot_ids=None,
                          owner=None, restorable_by=None,
                          filters=None):
        """
        Get all EBS Snapshots associated with the current credentials.

        :type snapshot_ids: list
        :param snapshot_ids: Optional list of snapshot ids.  If this list is
                             present, only the Snapshots associated with
                             these snapshot ids will be returned.

        :type owner: str
        :param owner: If present, only the snapshots owned by the specified user
                      will be returned.  Valid values are:

                      * self
                      * amazon
                      * AWS Account ID

        :type restorable_by: str
        :param restorable_by: If present, only the snapshots that are restorable
                              by the specified account id will be returned.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

        :rtype: list of :class:`boto.ec2.snapshot.Snapshot`
        :return: The requested Snapshot objects
        """
        params = {}
        if snapshot_ids:
            self.build_list_params(params, snapshot_ids, 'SnapshotId')
        if owner:
            params['Owner'] = owner
        if restorable_by:
            params['RestorableBy'] = restorable_by
        if filters:
            self.build_filter_params(params, filters)
        return self.get_list('DescribeSnapshots', params,
                             [('item', Snapshot)], verb='POST')