code: func (db *ProtoBrokerWrapper) ListValues(key string) (keyval.ProtoKeyValIterator, error) {
  	kv, err := db.ProtoBroker.ListValues(key)
  	if err != nil {
  		return kv, err
  	}
  	return &ProtoKeyValIteratorWrapper{
  		ProtoKeyValIterator: kv,
  		decryptData:         db.decryptData,
  	}, nil
  }
docs: // ListValues returns an iterator that enables to traverse all items stored
  // under the provided <key>.