raw_copy_file changes external file attributes of directory to regular file

[Forist2034]

Describe the bug
Using raw_copy_file on directory or symbol link make external file attributes changed to regular file

To Reproduce

fn raw_copy_dir() {
    let mut input = {
        let mut b = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
        b.add_directory("dir", zip::write::FileOptions::DEFAULT)
            .unwrap();
        b.finish_into_readable().unwrap()
    };
    let mut copied = {
        let mut b = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
        b.raw_copy_file(input.by_index(0).unwrap()).unwrap();
        b.finish_into_readable().unwrap()
    };

    {
        let f = copied.by_index(0).unwrap();
        println!("{:o}", f.unix_mode().unwrap()); // changes to 0o100755
    }
}

Expected behavior
External file attributes should be preserved by raw_copy_file