Synology - delete a folder in btrfs snapshot
login with ssh
sudo -sucd volume_root/\@sharesnap/folder/btrfs propertyset -ts ./GMT_XXX/ ro false
rm -Rf ./GMT_XXX/folder_to_deleterm -Rf ./GMT_XXX/#recycle/btrfs property set -ts ./GMT_XXX/ ro truelogin with ssh
sudo -sucd volume_root/\@sharesnap/folder/btrfs propertyset -ts ./GMT_XXX/ ro false
rm -Rf ./GMT_XXX/folder_to_deleterm -Rf ./GMT_XXX/#recycle/btrfs property set -ts ./GMT_XXX/ ro true