'Get the current space quota in bytes for disk space. None if it is unset'

@_coerce_exceptions
def get_diskspace_quota(self, path):

    path = encode_fs_path(path)
    space_quota = self.nn_client.getContentSummary(self.request_context, normpath(path)).spaceQuota
    if ((space_quota == QUOTA_RESET) or (space_quota == QUOTA_DONT_SET)):
        return None
    else:
        return space_quota
