read and modify file attributes / dates

[joergmschulz]

I've used the api to create a small application that copies files from one nextcloud to the other using download/upload. This works perfectly for a groupfolder setup when the used credential has correct access privileges.
BUT the file dates (creation, modification) are not transferred, as expected.
So, I'd like to see additional file attributes accessible in the API (dates, maybe shares, lables). Then I could read the original values and modify them in the target after copying.