如何Rust压缩目录？

use std::fs::File;
use flate2::Compression;
use flate2::write::GZEncoder;

fn main() -> Result<(), std::io::Error>{

 let gz = File::create("archive.tar.gz");
 let encoder = GZEncoder::new(gz, Compression::default());

 let mut tar = tar::Builder::new(enc);

 // add all files in the current directory to current_backup
 tar.append_dir_all(".", "current_backup")?;
  Ok(());

}

use std::fs::File;
use std::path::PathBuf;
use flate2::read::GzEncoder;
use tar::Archive;
use std::error::Error;

fn main() -> Result<(), Box<dyn Error>>{

  let file = File::open("path/to/archive.tar.gz")?;
  let mut archive = Archive::new(GzEncoder::new(file));

  println!("Extracted: ");

  archive.entries()?
    .filter_map(|e| e.ok())
    .map(|mut entry| -> Result<PathBuf, Box<dyn Error>> {
          let path = entry.path()?.to_owned();
          Ok(path.to_path_buf())
     })
    .filter_map(|e| e.ok())
    .for_each(|x| println!("> {}", x.display()));
    Ok(())
}