Properties for remote server are broken

Affected version

• Nightly flatpak: Yes

Steps to reproduce

1. Mount sftp://test.rebex.net/ (user: demo, password: password)
2. Open Properties

Current behavior

• Inadequately offers to open in Disks.
• Empty Parent Folder row.
• Wrongly asserts permissions are "None".

Expected behavior

• Shouldn't show device usage nor offer to open in Disks.
• Should show the parent of the FUSE mountpoint (e.g. /run/user/1000/gvfs), or not show the Parent Folder row at all.
• Should display the correct permissions, or "Unknown" if unknowable.
  • Or, actually, maybe Unix permissions are meaningless in SFTP and we should simply hide the Permissions row in these cases?