Function without_trailing_separators 

pub fn without_trailing_separators(path: &Path) -> PathBuf

Strip trailing path separators from a root operand. A trailing slash forces the OS to resolve the final component as a directory, which would dereference a symlink root like link/ (following it to its target). Stripping makes link/ behave like link (the symlink itself), which is then classified/operated on O_NOFOLLOW relative to its parent fd.