Users allowed to use incrontab.If empty then no user will be allowed to have their own incrontab. If <code>null</code> then will defer to <a href="/nixpkgs/option/services.incron.deny"><a href="/nixpkgs/option/deny" rel="nofollow">deny</a></a>. If both <a href="/nixpkgs/option/services.incron.allow"><a href="/nixpkgs/option/allow" rel="nofollow">allow</a></a> and <a href="/nixpkgs/option/services.incron.deny"><a href="/nixpkgs/option/deny" rel="nofollow">deny</a></a> are null then all users will be allowed to have their own incrontab.