How to detect file creation and file modification inside a directory?

Hi. I would like to port a inotify capable program to FreeBSD. I've 
asked around here and I was recommended to use libinotify-kqueue. This 
is nice because I wouldn't have to rewrite the inotify logic and I could 
just reuse it. Or so I thought.

My goal is to detect file creation and file changes in a specific 
directory. The way I do this is to inotify_add_watch(fd, "directory", 
IN_MODIFY). But I've found out that getting a IN_MODIFY event is pretty 
much impossible on FreeBSD. Here are my experiments: 
https://asciinema.org/a/DJMUCLyAWjyHgUQmG4BAfgDRU

I'm getting IN_OPEN and IN_ACCESS events. But these are ambiguous. I 
don't care about opening or accessing the files, I am interested in 
writing them. How can I detect this? Is libinotify-kqueue capable of 
this or should I look for alternatives? My other options are raw 
kqueue() and sysutils/direvent. sysutils/direvent doesn't really have a 
way to integrate it into a C++ program.