code: func (c *asyncClient) Lastsave() (result FutureInt64, err Error) {
  	var resp *PendingResponse
  	resp, err = c.conn.QueueRequest(&LASTSAVE, [][]byte{})
  	if err == nil {
  		result = resp.future.(FutureInt64)
  	}
  	return result, err
  
  }
docs: // Redis LASTSAVE command.