Files such as .DS_Store. - https://superuser.com/questions/318809/linux-os-x-tar-incompatibility-tarballs-created-on-os-x-give-errors-when-unt/688231#688231 - https://unix.stackexchange.com/questions/9665/create-tar-archive-of-a-directory-except-for-hidden-files/9865#9865
