Manage multi-level Ionic ionSideMenus

I need to manage a SideMenu (http://ionicframework.com/docs/api/directive/ionSideMenus/) with multi-level hierarchy. A nice solution can be use multiple views to manage with $stateProvider.state and change the content change the content inside of <ion-side-menu>, but I do not know how to do.

Option A |_ Sub-option 1 |_ Sub-option 2 Option B |_ Sub-option 1