How to boot ISO-image via SMB/CIFS

[MultimediaMan]

SMB is clunky... most of what Microsoft has shipped in last 10 years is clunky.

There is a way to do what you want... but it involves using the iPXE menu feature and disassembling the Multi-boot ISO (probably a fairly involved process, but ultimately a simpler solution). At the menu, you would select from a list of various PE images and then using Wimboot, execute the WIM desired... everything would be transferred via HTTP. You would avoid GRUB or GRUB2 this way, also.