I was just correcting the fact that ext4 is not limited to 16tb because people will read it and think that is true. It was not directly related to snapraid. And snapraid (and now the plugin) support split parity files on one drive removing any ext4 limitations. The FAQ you are reading on the snapraid page referencing ext4 limitations is very old since it doesn't mention split parity at all.
Oh, I didn`t know, thanks. So, I can use EXT4 for parity also even if I have >16TB parity file?!
And yes I remember about command mkfs.ext4 -m 0 -T largefile4 DEVICE
This split parity will be automatically or I have to do something for that?