code: func (msg *MsgFilterClear) BtcDecode(r io.Reader, pver uint32, enc MessageEncoding) error {
  	if pver < BIP0037Version {
  		str := fmt.Sprintf("filterclear message invalid for protocol "+
  			"version %d", pver)
  		return messageError("MsgFilterClear.BtcDecode", str)
  	}
  
  	return nil
  }
docs: // BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
  // This is part of the Message interface implementation.