Custom statusbar_selection_format: Printing the deepest common path of the selected files?

[TenTickles]

When we select, say, 5 files, the statusbar tells us the number of files, and the number of files selected, etc. We can customize it in Advanced Settings.

I want the statusbar to tell me the deepest folder that contains all the files selected. How can I do that?

And would it be significantly inefficient?

[void]

There's currently no option to do this in Everything.

This might be possible in a future release with formulas.