code: func (v *TreeModelFilter) ConvertPathToChildPath(filterPath *TreePath) *TreePath {
  	path := C.gtk_tree_model_filter_convert_path_to_child_path(v.native(), filterPath.native())
  	if path == nil {
  		return nil
  	}
  
  	p := &TreePath{path}
  	runtime.SetFinalizer(p, (*TreePath).free)
  
  	return p
  }
docs: // ConvertPathToChildPath is a wrapper around gtk_tree_model_filter_convert_path_to_child_path().