Angular CLI build dist without updating modified time of assets (e.g. images)

Is there a way to tell the Angular 4 CLI to copy assets into the dist folder without updating the file modified date/time?

My deployment app copies all files changed, and since all the files in assets folder get a new modified date/time it ends up copying everything every time - including a load of images and docs that never change.

I am considering moving the assets folder out of the project and copying them separately because of this, but that bugs me.

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