So, this is a problem...
I have mounted samba volume and I need to have write permissions for every new folder that's being created (currently, by default, on every newly created folder i have only read and execute permissions).
I tried changing umask, but with no effect on mounted folder, umask changed only for local filesystem. I tried mounting with umask option, but with no effect again.
I'm using ArchLinux on this machine, and I installed samba using default package manager (pacman).