can not add user

[ybaidiuk]

when i using command according to documentation
sudo docker exec timemachine add-account pi password tm /timemachine
i get follow errors:
chown: /timemachine/.Spotlight-V100/Store-V2/4B5837BF-6FA9-418C-B16C-CBC268CC8467/psid.db: Operation not permitted chown: /timemachine/.Spotlight-V100/Store-V2/4B5837BF-6FA9-418C-B16C-CBC268CC8467/tmp.Lion: Operation not permitted chown: /timemachine/.Spotlight-V100/Store-V2/4B5837BF-6FA9-418C-B16C-CBC268CC8467/Lion.created: Operation not permitted
etc ....

P.S. /etc/fstab (i use external HDD ExFat)
UUID=F988-8B5A /home/pi/tm exfat force,rw,user,auto 0 0