I successfully mounted an SMBv3 share following this post:
Basically:
config:
homeassistant:
media_dirs:
multimedia: /media
config:
shell_command:
mount_multimedia: !secret shell_mount_multimedia
secret:
shell_mount_multimedia: 'mkdir -p /media/multimedia && mount -t cifs -o username=foo,password=bar //192.168.12.34/media /media/multimedia'
And the automation at homeassistant startup with service:
shell_command.mount_multimedia
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