code: func RowKeyPrefixFilter(rowKeyPrefix kv.Key) kv.FnKeyCmp {
  	return func(currentKey kv.Key) bool {
  		// Next until key without prefix of this record.
  		return !bytes.HasPrefix(currentKey, rowKeyPrefix)
  	}
  }
docs: // RowKeyPrefixFilter returns a function which checks whether currentKey has decoded rowKeyPrefix as prefix.