message: rafs: use real inode number when get path from ino
  rafs v5 han v6 has different root inode numbers.
diff: @@ -20,7 +20,7 @@ use std::time::Duration;
  use anyhow::bail;
  use fuse_backend_rs::abi::fuse_abi::Attr;
  -use fuse_backend_rs::api::filesystem::{Entry, ROOT_ID};
  +use fuse_backend_rs::api::filesystem::Entry;
  use nydus_utils::compress;
  use nydus_utils::digest::{self, RafsDigest};
  use serde::Serialize;
  @@ -550,7 +550,7 @@ impl RafsSuper {
  /// Convert an inode number to a file path.
  pub fn path_from_ino(&self, ino: Inode) -> Result<PathBuf> {
  - if ino == ROOT_ID {
  + if ino == self.superblock.root_ino() {
  return Ok(self.get_inode(ino, false)?.name().into());
  }
  @@ -563,7 +563,7 @@ impl RafsSuper {
  let e: PathBuf = inode.name().into();
  path = e.join(path);
  - if inode.ino() == ROOT_ID {
  + if inode.ino() == self.superblock.root_ino() {
  break;
  } else {
  cur_ino = inode.parent();
  