FeatureLayer in GroupLayer

Hi,

I would like to Export a FeaturLayer which is in several Group Layers into a lyr-File.
The Problem is: The Grouplayers have to be exported, too, so the structure of the Layers stayes the same.
But I can't find a way how to get to know if a FeatureLayer is within a GroupLayer, or if a GroupLayer is in another GroupLayer.

And if i loop through all GroupLayers I don't know which one is at the top.

Any idea, how to get this infos?

Thanks
M.