<https://www.reddit.com/r/sysadmin/comments/5fm9lg/windows_equivalent_of_umask/>:

Q: What is the Windows/ Windows Storage server equivalent of a umask?

A: I'm not aware of a direct equivalent; NTFS permissions are
hierarchical in general, so you should be looking at changing the ACLs
on the parent directory, possibly involving CREATOR_OWNER depending on
what you want to do.

A: There is none. In Windows, new files and folders will inherit the
permissions of the directory that they are originally created in.

A: The equivalent would be inheritance. Set the permissions on a parent
folder.