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create a test directory in /mnt/user/Downloads root@MediaStore:/mnt/user/Downloads# ls -al test total 0 drwx------ 1 root root 0 Jan 20 23:33 ./ drwxrws--- 1 nobody users 205274 Jan 20 23:33 ../ root@MediaStore:/mnt/user/Downloads# ls -ld /mnt/{cache,user}/Downloads drwxrws--- 1 nobody users 205274 Jan 20 23:33 /mnt/cache/Downloads/ drwxrws--- 1 nobody users 205274 Jan 20 23:33 /mnt/user/Downloads/ when this directory is mounted in a container like so root@MediaStore:~# docker run --rm --name box -d -v /mnt/cache/Downloads:/media alpine sleep 3600 131ed3b6357ba8253513afc5e536361adf39de6ac5ca26ccdf22337770d60c76 root@MediaStore:~# docker exec -u 1002 -it box sh -c 'id; ls -ld /media; touch /media/a_file && ls -l /media/a_file' uid=1002 gid=0(root) drwxrws--- 1 99 users 205274 Jan 20 15:33 /media touch: /media/a_file: Permission denied root@MediaStore:~# docker stop box box root@MediaStore:~# docker run --rm --name box -d -v /mnt/user/Downloads:/media alpine sleep 3600 0dc76c0b4c8c6cf3f7b05c998a96e96a18e6f394e0e0bada60b66db3225c17c8 root@MediaStore:~# docker exec -u 1002 -it box sh -c 'id; ls -ld /media; touch /media/a_file && ls -l /media/a_file' uid=1002 gid=0(root) drwxrws--- 1 99 users 205274 Jan 20 15:33 /media -rw-r--r-- 1 1002 root 0 Jan 20 15:40 /media/a_file root@MediaStore:~# docker stop box box Seems like when the path is mounted via the user share path, the file permissions can be ignored in a specific situation Edit: It seems to be shfs itself - since the following issue occurs at the Unraid level root@MediaStore:/mnt/user/Downloads# echo x > a root@MediaStore:/mnt/user/Downloads# chmod 600 a root@MediaStore:/mnt/user/Downloads# ls -l a -rw------- 1 root root 2 Mar 23 21:44 a root@MediaStore:/mnt/user/Downloads# ls -l /mnt/cache/Downloads/a -rw------- 1 root root 2 Mar 23 21:44 /mnt/cache/Downloads/a root@MediaStore:/mnt/user/Downloads# cat a x root@MediaStore:/mnt/user/Downloads# su nobody -s /bin/sh nobody@MediaStore:/mnt/user/Downloads$ cat a x nobody@MediaStore:/mnt/user/Downloads$ cat /mnt/cache/Downloads/a cat: /mnt/cache/Downloads/a: Permission denied nobody@MediaStore:/mnt/user/Downloads$ echo y > a nobody@MediaStore:/mnt/user/Downloads$ cat a y mediastore-diagnostics-20210120-2344.zip