Implications of exposing /var/lib/docker over NFS to serve hosts with limited memory

What are the implications of exporting /var/lib/docker over NFS? The idea is to store the docker images in a server and export it to hosts which has limited memory to store and run containers. This would be useful to avoid having each host download and store it's own library of docker image. The hosts may make use of FS-Cache to limit the data transfer over network.