Hello Jac70,
Rac8006 and I went through this samba thing on another thread and Rac8006 found a much more interesting find then just Samba.
I did disable Samba overnight and it did not make a huge difference; unlike the (multinas) Samba problem that Rac8006 had encountered and eventually found a fix for Samba which was submitted to WD hopefully for inclusion in the next firmware release in 2020 
I did however wanted to revisit this thread and edit my first post to include Rac8006s’ findings with changing mounting with relatime to mounting the root partion with noatime.
Thus here are the final ingrediants in reducing the overall wakeups through the night. It doesn’t eliminate all, but is adquate for now until WD completely eliminates them all in the year 2020.
Check out the following threads if you want to understand why changing the atime works.
http://community.wd.com/t5/WD-My-Cloud/partition-mount-options/td-p/874547
also this thread of which I thought I was just entertaining crazy Rac8006 on his theory of atime and to discover that it actually was a true fix.
http://community.wd.com/t5/WD-My-Cloud/disk-standby/td-p/874032
Final ingrediants to Sleep (credits goes to Rac8006, so give him the kudos for being persistent)
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adding an extra sync to the monitorio script helps a lot with reducing the number of 7 second wake ups down to only one or two per night.
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after SSH’ing into the device issue the following mount command… don’t worry nothing untoward will happen and if it does, blame Rac8006 please…
mount -o remount,noatime,nodiratime /dev/root /
you could also use mine
mount -o remount,noatime /dev/root /
The difference is that I assume noatime encompassing nodiratime.
