Glance folder to store images

I noticied in the glance configuration file after deploying openstack that filesystem_store_datadir=/var/lib/glance/images/ however, upon inspection, I found that images weren't stored in that folder, instead all images where located in this folder */var/lib/docker/volumes/glance/_data/images/.* So I'm thinking if actually filesystem_store_datadir is not used to store images but maybe something else.