>>108
https://doc.owncloud.org/server/8.1/admin_manual/configuration_user/user_auth_ldap.html
の
User Home Folder Naming Rule:
By default, the ownCloud server creates the user directory in your ownCloud data directory.
You may want to override this setting and name it after an attribute value. The attribute given
can also return an absolute path, e.g. /mnt/storage43/alice. Leave it empty for default behavior.
Example: cn
このあたりをいじるか
Expert Settings　の Internal Username:、Override UUID detection
をいじると変更できるかも。