This layer helps quickly sorting Dired buffers in various ways, such as
time, size, etc.
I think the underlying package is useful and worth a place in spacemacs.
It has also been promoted by Pragmatic Emacs before (albeit long time
ago): http://pragmaticemacs.com/emacs/speedy-sorting-in-dired-with-dired-quick-sort/
Disclaimer: I'm the author of dired-quick-sort package