Up navigation examples are hard to find

[LeafyLappa]

It seems that all examples for "up" back arrow navigation are in the "legacy-architecture-samples". A bit hard to find especially as they are "legacy" and written in java.

By up navigation I mean this:

https://github.com/Zhuinden/simple-stack/blob/842bfc781fa16568af956c4985c1f8ca02da0a6c/samples/legacy-architecture-samples/simple-stack-example-mvvm-fragments/src/main/java/com/zhuinden/simplestackexamplemvvm/application/BaseKey.java#L65