How to show only the groups you are part of in a private board?

I'm using the My Groups component on a private board and only want the groups from the private board to show in the My Groups component (not all groups I have access to from every area). I've just been told this is not possible from the My groups component, and we would have to create a custom component for this. 

Has anyone here tried to do this or can give me some suggestions?

Thanks

Em