Thanks for your response!

I did have a look at the pseudo and btrfs-progs repository and noticed that the 
pseudo repository contains the following code in ./ports/unix/guts/ for the 
nftw() system call:

rc = real_nftw(path, fn, nopenfd, flag);

So, it seems that the wrapper for the nftw() system call just forwards it to 
the underlying system (the host, right?). Is that the reason why the btrfs 
filesystem creation does work, but files are owned by the build host user?
I'm guessing there need to be some code around it to support the "fake root 
environment" that pseudo is trying to achieve?
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