SUMMARY

Solid::NetworkShare does not know the network filesystem SMB3 and, thus, mounts with that filesystem are not detected on the system.

STEPS TO REPRODUCE

1. Connect a slot to the deviceAdded() signal of Solid::DeviceNotifier::instance().

2. Add the following if statement to the slot: 

if (device.isDeviceInterface(Solid::DeviceInterface::NetworkShare)) {
    qDebug() << "success";
} else {
    qDebug() << "failure";
}

3. Mount a Samba share with the SMB3 filesystem:

$ mount.smb3 //server/share /mount/point

OBSERVED RESULT

The output will always be "failure", even when a share with an SMB3 filesystem
is mounted.

EXPECTED RESULT

The output is "success" when a share with SMB3 filesystem is mounted and 
"failure" otherwise.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Kernel Version: 5.13.13-1-MANJARO (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION