code: func (c *ClientManager) RestoreFromSnapshot(volumeId int, snapshotId int) error {
  	_, err := c.StorageService.Id(volumeId).RestoreFromSnapshot(sl.Int(snapshotId))
  	return err
  }
docs: // Restores a specific volume from a snapshot.
  // volumeId: The id of the volume
  // snapshotId: The id of the restore point