BUG: "Don't scan content in backups" setting fails with multiple Time Machine destinations

Steps to reproduce:

* Configure macOS with more than one network-connected Time Machine destination, eg., two different NAS devices

* From the Time Machine menu, "Enter time machine" and wait for all targets to mount, then restore any file and exit Time Machine

* Open a shell and type the following to see a list of mounted Time Machine backups: mount|grep "Time Machine Backups"

Example results:

$ mount |grep "Time Machine Backups" |sort
/dev/disk5s2 on /Volumes/Time Machine Backups (hfs, local, nodev, nosuid, journaled, nobrowse)
/dev/disk6s2 on /Volumes/Time Machine Backups 1 (hfs, local, nodev, nosuid, journaled, nobrowse)
/dev/disk7s2 on /Volumes/Time Machine Backups 2 (hfs, local, nodev, nosuid, journaled, nobrowse)

* Open BitDefender and ensure the "Don't scan content in backups" setting is enabled

* In BitDefender, start a system scan

Observed:

* BitDefender tries to scan the contents of "/Volumes/Time Machine Backups 1" and "/Volumes/Time Machine Backups 2"

Expected:

* BitDefender should respect the "Don't scan content in backups" setting

Notes:

* The key problem appears to be that BitDefender only omits mounted disk images named "Time Machine Backups." But Time Machine may mount multiple volumes with numbered suffixes when multiple network destinations exist.