code: func (s *Sentinel) Slaves() ([]*Slave, error) {
  	res, err := s.doUntilSuccess(func(c redis.Conn) (interface{}, error) {
  		return queryForSlaves(c, s.MasterName)
  	})
  	if err != nil {
  		return nil, err
  	}
  	return res.([]*Slave), nil
  }
docs: // Slaves returns a slice with known slaves of master instance.