User with no privilege can mount erofs to dir with:
busctl --system call org.deepin.linglong.SystemHelper \
/org/deepin/linglong/FilesystemHelper \
org.deepin.linglong.FilesystemHelper \
Mount \
sssa{sv} \
'/var/lib/linglong/vfs/blobs/6f6b34b09e8a72ec52013407289064f5' \
'/run/user/1000/linglong/vfs/layers/com.qq.music/1.1.3/x86_64/' \
'erofs' \
0