GDriveFileSystem support for shared files / shortcuts

Hi, does `GDriveFileSystem` support manipulation of files in the `shared with me folder`? Like copy from my drive to a folder shared with me.

If not, I can create a shortcut in my drive and use the shortcut as path for the file / folder?

From the tries I have done, the second option doesn't work, `GDriveFileSystem` does not take care of getting the `targetId` of the shortcut etc..

I would like shortcut to be transparent proxies to the real file / folder, so that for example `ls` on the shortcut of a folder give me the content of it.
Things get complicated with other methods like:
- you can copy a shortcut of a folder, but not the folder itself (at least not in one API call)

Reference:
- https://github.com/iterative/PyDrive2/issues/74
- https://github.com/iterative/PyDrive2/issues/218