CIFS/SMB hooks or implementation

Hi all, sorry if this is not the best place to post this, please let me know
if there's somewhere better.

I'd like to implement something that allows access to NTFS filestore on
Windows 2000 etc through CIFS/SMB protocol (ie file sharing), but allows me
programmatic hooks into attempts to access files, so I can selectively
supply my own data for it.

Do you know if it's possible to add hooks like this to the standard
implementation of CIFS/SMB on Windows, or if there are any third party
implementations that offer hooks or offer source code and run on Windows?

Thanks,
Dave