to add more context, here's macOS ancient definition on where does what live:

https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html#//apple_ref/doc/uid/TP40010672-CH2-SW6
https://x.com/5422m4n/status/2023018129576829173