Export only modified and added files with folder structure in Git

by 
git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT $commit_id

  1. git diff-tree -r $commit_id:

    Take a diff of the given commit to its parent(s) (including all subdirectories, not just the top directory).

  2. --no-commit-id --name-only:

    Do not output the commit SHA1. Output only the names of the affected files instead of a full diff.

  3. --diff-filter=ACMRT:

    Only show files added, copied, modified, renamed or that had their type changed (eg. file → symlink) in this commit. This leaves out deleted files.

UPDATE FROM THE COMMENT:
Base on the question context and the comments below, with the following command, you can get the ACMRT files as a .tar file with their folder structure. 

git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT $commit_id | tar -czf file.tgz -T -

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