I want to clear all data from store when a user will transition 
on a different route. 

I want to make this clear when the transition is done on any route but
not a sub-route (I have nested-routes).

So, in event `willTransition` I need somehow to check if the transition
route is a sub route of the parent route. In this case, I want to keep
all data from the store, otherwise I should call `this.store.unloadAll('my-object');`

Thanks