[BUG] Tag editing fails for libraries on mounted cifs volumes #600

Describe the bug
My music library is stored in a SMB share for access across my network. My linux machine has the share mounted via a systemd mount, with the uid/gid set to be my user's. I have RW permissions on all files in the mount and can create and modify all files in the mount in other programs.

When ncmpcpp is pointed at either the mounted volume (/mnt/<vol>/music), or at a symlink to this directory from within my homedir (~/music), all tag updates fail with a Permission denied error. I have double checked the permission bits, and all files/dirs show 755 for the permissions.

When I point ncmpcpp/mpd at a directory local to my machine with the same files in the same structure with the same permission bits, tag writing works as expected

To Reproduce
Steps to reproduce the behavior:

1. Mount a cifs volume via systemd, using your user's uid and gid
2. Point mpd/ncmpcpp at the volume
3. Attempt to edit tags on any file
4. See Permission denied error

Expected behavior
ncmpcpp is able to successfully update tag information

Screenshots/Logs
Error in the tui

Permission bits on the file in question

ps output showing the user attached to both the mpd and ncmpcpp

Desktop (please complete the following information):

• OS: Arch Linux, Kernel 6.6.40-2-lts
• Terminal: Alacritty
• Version ncmpcpp v0.9.2