how to register a upper filter driver to all printers class via .inf file (AddReg section)

Question

I have a filter driver (similar to following):

NTSTATUS MyFilterFunction (
    __in PDEVICE_OBJECT DeviceObject,
    __in PIRP Irp
){
    NTSTATUS status = STATUS_SUCCESS;
    // do the filtering
    DbgPrint("Filtering with MyFilterFunction");
    return status;
}

NTSTATUS DriverEntry (
    __in PDRIVER_OBJECT  DriverObject,
    __in PUNICODE_STRING RegistryPath
){
    NTSTATUS status = STATUS_SUCCESS;
    DriverObject->MajorFunction[IRP_MJ_CREATE] = MyFilterFunction
    return status;
}

I have made this inf file to attach the filter to printers-class drivers-stack.
The problem is that when printing, the function DbgPrint does not output anything in DebugView, as if it's never called.
Note that I use a network printer, not a local printer attached to the machine.