Impose Space Usage at Group and User Level

I am aware of the ability to limit the size of projects (global, group and project levels), and the ability to restrict the number of projects a user can create. However what we are looking for is a way to impose a total space for a user or a group (basically a total size limitation per namespace, regardless of the number of projects).

Is there a way to do this that I haven’t come across?

Thanks,
Bob Jones