Initial disk space usage

I did an ncdu report right after installing my personal cluster from scratch. If shows an initial 17,3 GiB (!) in /var/lib/docker/overlay2/. That's kind of insane.

-- / -------------------------------
  17.3 GiB [##########] /var     
   1.4 GiB [          ] /usr
 333.5 MiB [          ] /snap 
  97.3 MiB [          ] /lib
  73.4 MiB [          ] /tmp 
  67.7 MiB [          ] /opt
  67.2 MiB [          ] /root 
  46.1 MiB [          ] /oas 
--- /var/lib/docker ------------------------
                         /..
   16.2 GiB [##########] /overlay2          
   45.0 MiB [          ] /volumes
   14.9 MiB [          ] /image
    4.1 MiB [          ] /containers
  104.0 KiB [          ] /network
   56.0 KiB [          ] /buildkit
   16.0 KiB [          ] /builder

I couldn't find a way out of the box how to display the details of this (what's taking how much space in docker?).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information