@Override
    public void onDetach() {
        super.onDetach();
        if (rootRequestManagerFragment != null) {
            rootRequestManagerFragment.removeChildRequestManagerFragment(this);
            rootRequestManagerFragment = null;
        }
    }
Returns true if the fragment is a descendant of our parent.
core/src/main/java/com/bumptech/glide/manager/SupportRequestManagerFragment.java