@tubetime

Here's an example of something that is *almost* right:

acmesystems.it/www/pcb_usb/USB

The problem is with the choice of putting a capacitor at location C106.

Having a capacitor there is great for AC coupling and DC blocking, which are both exactly the opposite of what we want in binding chassis ground to the digital supply return path.

For many reasons (including to pass regulatory EMI/EMC testing), we want conductivity that is high at low frequencies and to tapers off as frequencies increase. A ferrite bead is the best choice I've found for such a spot.