I'm not sure what your question is as a copy command and a mount aren't the same in how they operate.
A copy, you can limit the # of transfers and checkers and such.
A mount you don't have transfers are you have people/processes accessing a mount.
You have:
--bwlimit-file BwTimetable Bandwidth limit per file in kBytes/s, or use suffix b|k|M|G or a full timetable.
which I use to limit bandwidth per file.