> Tools such as ls or stat report the size of a directory. Of course it is not the content size.
> stat -c %s  /home/sergio/.config
> 6550
>
> What does 6550 mean in btrfs context?

Regardless of filesystem type, the size of a directory is the sum of the sizes
of the struct linux_dirent (or linux_dirent64) for the filenames of the contained files.
See the manual page "man 2 getdents".
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