Selection from a collapsible nested list

Hello

I'm trying to implement search filter functionality. Basically, i want the user to be able to select from a nested list of locations (Region->Province->City). When the user clicks on a location, it will expand all child locations (if they exist) and the user can select from them. The catch here is that i want even the parent locations to be selectable as well (showing listings from all parent location's children). Is it possible for example, to design a collapsible nested list with a radio button next to each location?

I'm loading all locations at once so I'm not using any ajax calls.