I haven't looked at the details, but

--8<---------------cut here---------------start------------->8---
> guix size docker
store item                                                       total    self
/gnu/store/w8gjhcw6a16rk1dvxa97bz2znal5fihm-go-1.13.9              639.1   350.7  28.2%
--8<---------------cut here---------------end--------------->8---

Then

--8<---------------cut here---------------start------------->8---
> grep w8gjhcw6a16rk1dvxa97bz2znal5fihm dockerd
Binary file dockerd matches
--8<---------------cut here---------------end--------------->8---

--
Pierre Neidhardt
https://ambrevar.xyz/