message: nydus-image/inspect: check if iterated inode is a child
  If nydus image bootstrap is  corrupted somehow, this help
  us to notice the issue ASAP.
diff: @@ -133,6 +133,7 @@ impl RafsInspector {
  mut op: impl FnMut(&OsStr, &OndiskInode, u32) -> Action,
  ) -> Result<()> {
  let (dir_inode, _) = self.load_inode_by_index(self.cur_dir_index as usize)?;
  + let parent_ino = dir_inode.i_ino;
  let children_count = dir_inode.i_child_count;
  // FIXME: In fact, `i_child_index` is the first inode number rather than index
  @@ -142,6 +143,11 @@ impl RafsInspector {
  for idx in first_index..=last_index {
  let (child_inode, name) = self.load_inode_by_index(idx as usize)?;
  +
  + if child_inode.i_parent != parent_ino {
  + bail!("File {:?} is not a child of CWD", name);
  + }
  +
  trace!("inode: {:?}; name: {:?}", child_inode, name);
  match op(name.as_os_str(), &child_inode, idx) {
  Action::Break => break,
  