'Locate backend snapshot dict associated with cinder snapshot id.
:returns: Cinder snapshot dictionary if found, None otherwise.'

def _get_snapshot_from_lun_snapshots(self, cinder_volume_id, cinder_snap_id):

    try:
        snaps = self.vmem_mg.snapshot.get_snapshots(cinder_volume_id)
    except vmemclient.core.error.NoMatchingObjectIdError:
        return None
    key = self._compress_snapshot_id(cinder_snap_id)
    for s in snaps:
        if (s['comment'] == key):
            s['comment'] = cinder_snap_id
            return s
