Snap Areas Z axis (foreground/background)

When Snap Areas overlap, it would be nice to have control over the Z axis of the area. For example: A small area "inside" a bigger one. The small one should be on top of the bigger one. I have not found any way to control which area is in the foreground.

See screenshot attached. The green arrow illustrates the small area ist correctly "on top" of the others. The red arrows showing the opposite.