bug#44273: "total used in directory 19 available 5.2 GiB"

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  mattiase@acm.org,  larsi@gnus.org,
>   jidanni@jidanni.org,  stefankangas@gmail.com,  44273@debbugs.gnu.org
> Date: Fri, 30 Oct 2020 09:18:42 +0200
> 
> > It is easy for a user to make a dired-mode-hook function delete that
> > line if it is present.
> 
> Maybe it could help to show some explanation with tooltips
> over cryptic parts of that line.

Given that the units seem to be in general unknowable, what would you
suggest to say in that tooltip?