Hello @benibilme 
Where? Which Distro?
I read this: 'Re: /etc/fstab.d yes or not (resolved)' - MARC and this: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=663623
If you need something like fstab.d then have a look at systemd.mount
I used it also for nfs and it works perfectly good.