Comment by p_ing

Yes, won't be that quite in depth given no source code, but you can easily look up the NT4 source code on GitHub if you want to dive that deep. I would assume much of that code should still be relevant today.

Also worth tracking down a copy of the NT OS/2 Design Workbook on the web (another leak).

And Inside the Windows NT File System by Helen Custer is a very short book but describes the very early state of NTFS capabilities/functions.