Good (or morning afternoon evening night)

;; Following code kills the top level directory:
emacs -Q ~
M-x dired-kill-subdir


In GNU Emacs 25.0.92.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.29)
  of 2016-03-15 built on calancha-pc
Repository revision: dbfbedd3d0f3afcfb811eae0e1a7b1c33fb27735