“It” meaning Samba? Samba is only a collection of tools and libraries. It doesn’t copy your files for you. As far as your system’s power management situation goes, that is all handled via various monitors to check statuses of certain things IN /proc, /sys, dbus, lsof…etc.
Not every program or service on your system is calling out to something else to say “HEY, IM WORKIN’ HEEERRRRREEE” everytime it goes to do something like copy files or do something YOU seem worthy of preventing sleep. Depending on your environment, you can tune this however you want, or how about just not sleeping and solving your problem right there? Write a helper or alias to trigger something that inhibits sleep when you’re doing something important, or maybe make sure you’re using proper mounts and a file manager. Lots of options here.
TLDR: Samba project ain’t gonna fix your power issues.