Extension Not Working at All in Mounted Drives in Windows

Type: LanguageService

Describe the bug

• OS and Version: Windows_NT x64 10.0.17763.
• VS Code Version: 1.36.1 (user setup).
• C/C++ Extension Version: 0.24.1.
• Other extensions you installed (and if the issue persists after disabling them): Mostly just themes (issue persists after disabling them).
• A clear and concise description of what the bug is:
  The intellisense is not working at all (such as the the CTRL-click feature to follow a symbol's location where it was firstly defined) in folders/workspaces that exist in a mounted drive in Windows (tested using a mounted drive using SSHFS-Win32 in https://github.com/billziss-gh/sshfs-win).

To Reproduce

1. Mount a network drive (e.g. using SSHFS-Win32 above).
2. Open a C/C++ project inside the mounted drive.
3. Try one of the intellisense features (such as following a symbol's first defined location).

Expected behavior
Intellisense features with properly setup IncludePath should work as expected in mounted drives' folders. For example, Clicking CTRL and hovering over a symbols should underline and change color of that symbol. Clicking that symbol should jump to the location of the item where it was first defined. Also, clicking a combination of CTRL-space on certain locations should show possible auto-complete features for these locations.

Actual behavior
None of the above behaviors work on mounted drives.

Start by reproducing the reported IntelliSense failures in a C/C++ project on a Windows mounted drive using the listed reproduction steps. Compare symbol navigation and autocomplete behavior with a local workspace; done means the described IntelliSense features work on mounted drives with a configured IncludePath.