Get all Volumes of type Snapshot.  Updates every time - no caching.
        :return: a `list` of all the `ScaleIO_Volume` that have a are of type Snapshot.
        :rtype: list

def snapshots(self):
        """
        Get all Volumes of type Snapshot.  Updates every time - no caching.
        :return: a `list` of all the `ScaleIO_Volume` that have a are of type Snapshot.
        :rtype: list
        """
        self.connection._check_login()
        response = self.connection._do_get("{}/{}".format(self.connection._api_url, "types/Volume/instances")).json()
        all_volumes_snapshot = []
        for volume in response:
            if volume['volumeType'] == 'Snapshot':
                all_volumes_snapshot.append(
                    Volume.from_dict(volume)
            )
        return all_volumes_snapshot