fn create_dir(&mut self, path: &str, mtime: u64, permissions: u16) -> Result<(), Self::Error>;

    fn create_dir(&mut self, path: &str, mtime: u64, permissions: u16) -> Result<(), Self::Error> {
        let mut header = tar::Header::new_gnu();
        header.set_mode(permissions as u32);
        header.set_mtime(mtime);
        header.set_entry_type(tar::EntryType::Directory);
        if let Some(ref prefix) = self.prefix {
            let path = prefix.clone() + path;
            self.archive.append_data(&mut header, &path, &[][..])?;
        } else {
            self.archive.append_data(&mut header, &path, &[][..])?;
        }
        Ok(())
    }

                    let len = next_files.len();

                    if len == next_files.len() {
                        arch.create_dir(&path, latest_touch, output_item.meta.permissions()).map_err(ArchiveError::A)?;
                    }