Mountpoint reports non-mount point directories like /etc as mount points while it shouldn't

[Alxhr0]

Version of uutils util-linux is master

Uutils version:

./target/release/util-linux mountpoint /etc
/etc is a mountpoint

Version of GNU util-linux is 2.40

GNU version:

mountpoint /etc
/etc is not a mountpoint

It seems to be getting confused on BTRFS? especially in the inode check since when I checked inode was 293 for /etc on my system

#[cfg(not(windows))]
fn is_mountpoint(path: &str) -> bool {
    let metadata = match fs::metadata(path) {
        Ok(metadata) => metadata,
        Err(_) => return false,
    };

    let dev = metadata.dev();
    let inode = metadata.ino();

    // Root inode (typically 2 in most Unix filesystems) indicates a mount point
    inode == 2
        || match fs::metadata("..") {
            Ok(parent_metadata) => parent_metadata.dev() != dev,
            Err(_) => false,
        }
}