Docker export & files will be losed or changed

I have a standard filesystem archive named filesystem.tar .
I convert it into a Docker image by running
cat filesystem.tar | docker import - test:new

Then, I start a container from this image.
docker run --name test -itd test:new /bin/bash

just export the filesystem of the container directly into a tar file.
docker export test > docker_tarball.tar

I want to know what kind of files will be modified or lost during this process, such as /etc/hosts , /etc/resolv.conf , etc.
I would like to understand the changes that will occur in the exported filesystem.