IF you are sure nothing important has a share mounted (which could be anything, stuck session that is no longer, etc).  I just ssh to my unRAID server and execute: ps -ef | grep /mnt/user   I then take the PID and perform a graceful kill (I've only had to do kill -9 once) kill <PID>   as soon as all mounts in the process go away, your array stopping will be successful.
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