code: func CommentIncludeParent(request *http.Request, comment *comment.Comment, data *app.Comment, href HrefFunc, parentType string) {
  	data.Relationships.Parent = &app.RelationGeneric{
  		Data: &app.GenericData{
  			Type: &parentType,
  			ID:   ptr.String(comment.ParentID.String()),
  		},
  		Links: &app.GenericLinks{
  			Self: ptr.String(rest.AbsoluteURL(request, href(comment.ParentID))),
  		},
  	}
  }
docs: // CommentIncludeParent adds the "parent" relationship to this Comment