code: func (msg *MsgGetCFilters) BtcEncode(w io.Writer, pver uint32, _ MessageEncoding) error {
  	err := writeElement(w, msg.FilterType)
  	if err != nil {
  		return err
  	}
  
  	err = writeElement(w, &msg.StartHeight)
  	if err != nil {
  		return err
  	}
  
  	return writeElement(w, &msg.StopHash)
  }
docs: // BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
  // This is part of the Message interface implementation.