Change 'Date Modified' on Parent Folder?

When a file is added to a subfolder, the parent folder's date modified does not change, as seen here:

Is there a rule that I can run that monitors 'subfolder' and updates 'top level folder' (perhaps via 'touch') when new files are added to it?

Is there a rule that I can run that monitors 'subfolder' and updates 'top level folder' (perhaps via 'touch') when new files are added to it?