Samba mount silently fails

[mainrs]

Cosmic-files version:

Commit ee7954e.

Issue/Bug description:
Mounting a samba share using the GUI dialog under Network visually seems to work. The drive gets added to the left-hand side panel and is highlighted. However, clicking on it does nothing. The drive seems to load indefinitely.

Steps to reproduce:

1. Add samba drive via network GUI to cosmic-files.
2. Open said drive.

Expected behavior:
The content of the drive is shown.

Other notes:
I closed cosmic-files and used PCManFM-Qt (LXQT's file manager) and the samba drive was listed there, too. Seems like the gio mount worked. I could also browse the content of the share in PCManFM-Qt. So the mount was also successful.

Any way I can provide more information for debugging purposes? I ran cosmic-files with RUST_LOG=cosmic_files=debug,gio=debug cosmic-files, but that didn't show any error message.

Might be related to #582.