code: func NewMsgGetCFilters(filterType FilterType, startHeight uint32,
  	stopHash *chainhash.Hash) *MsgGetCFilters {
  	return &MsgGetCFilters{
  		FilterType:  filterType,
  		StartHeight: startHeight,
  		StopHash:    *stopHash,
  	}
  }
docs: // NewMsgGetCFilters returns a new bitcoin getcfilters message that conforms to
  // the Message interface using the passed parameters and defaults for the
  // remaining fields.