> all system calls had to go through libc (or perhaps a big ntdll.dll-like
Which makes containers crap on Windows and *BSD as they have to run the currect libc or equivalent. Thus you need to build a different container per OS version which sucks compared to Linux.
Windows doesn't even have its own libc.
Windows does have three libc, likely as a compability layer. their names are:
They said "or equivalent", so ntdll