Can't show current dir & parent dir

[Billy4195]

As I followed the Build and Run section to test the mounted file system. The two directories . and .. didn't show correctly.

Step to reproduced

$ sudo mkdir dir1
$ ls -al
total 1
drwxr-xr-x 2 root root 4096  4月 10 17:34 dir1
$ cd dir1
$ ls -al
total 1
drwxr-xr-x 2 root root 4096  4月 10 17:32 .