Samba Share doesn't mount after "reboot"

yep that should work. I did a quick test on a demo system and for me it looks like this

//192.168.0.10/Share /mnt/samba cifs username=xxxx,password=xxxxn,iocharset=utf8,uid=dietpi,gid=dietpi,file_mode=0770,dir_mode=0770,vers=3.1.1,_netdev,nofail,noauto,x-systemd.automount