How to make a default layout for all modules' views?

This is what I am trying to do:

views module1 controller1 action1.tpl controller2 action2.tpl index.tpl module2 controller1 action1.tpl controller2 action2.tpl index.tpl

I want module2 to get the index.tpl from the parent directory automatically. But I cannot do that when I am writing:

public function registerServices($di) {
    // dispatcher here

    $view = $di->get('view');
    $view->setViewsDir(realpath($view->getViewsDir().'/module2'));
    $di->set('view',$view);
 }

because this way, the views directory root is changed to module2 and now it has no idea about the parent. What can I do to achieve that and have a unified layout throughout the application if the module doesn't have its own layout.