Add support for btrfs

[andy5995]

Discussed in #447

^{Originally posted by luigir-it March 26, 2024}
Hi.
Today I did some changes on how I handle trash. I decided to create a @Trash subvolume and symlink ~/.local/share/Trash to it.
There aren't any issue with Dolphin (KDE gui file manager), everything works as before: I can trash files, folders, restore them...

But the utility I was using before (trash-cli) stopped working. So I tried everything else I could find on the AUR, and none of them did work.
I came across rmw, and it looks simple and straightforward, but has the same issue: with WASTE=$HOME/.local/share/Trash in the config file, deleting files yield this result:
:error: while trying to move (rename) haha -> /home/luigi/.local/share/Trash/files/haha_195333-240326 -- remove_to_waste:L362 rename(): Invalid cross-device link

This Invalid cross-device link is the same output error of trash-cli and similar utilities.

Is there a way to fix it? Like I said, Dolphin works fine with this new setup.