R0b0t1 added the comment:
https://bugs.python.org/issue29707#msg331921
> But what is the problem with getting False for bind mounts on the same
> filesystem?
When doing directory traversal it is important to not duplicate listings. It
seems this can cause duplication. I'm replying t
New submission from R0b0t1 :
Using `os.walk` to traverse a filesystem on Windows does not terminate in the
case of a recursive mountpoint existing somewhere in the path.
In my case C:\circlemount is linked to C:\, producing paths such as
C:\circlemount\circlemount\circlemount\circlemount
