Delete the builder cache

        Returns:
            (dict): A dictionary containing information about the operation's
                    result. The ``SpaceReclaimed`` key indicates the amount of
                    bytes of disk space reclaimed.

        Raises:
            :py:class:`docker.errors.APIError`
                If the server returns an error.

def prune_builds(self):
        """
        Delete the builder cache

        Returns:
            (dict): A dictionary containing information about the operation's
                    result. The ``SpaceReclaimed`` key indicates the amount of
                    bytes of disk space reclaimed.

        Raises:
            :py:class:`docker.errors.APIError`
                If the server returns an error.
        """
        url = self._url("/build/prune")
        return self._result(self._post(url), True)