Display last modification (and last access?) time

[Tungstwenty]

Just like the attributes name / size / count, it would be very useful to have a way to see the last modification time of each folder - and sort by that as well - when searching for "old big contents" lying around.

Note that it might be needed to fetch the newest date for all contents inside of a folder and use that instead of the actual date from the folder being analyzed. It seems to be true that modifying a file directly inside a folder also changes the folder's date, but modifying a file inside a subfolder changes the date of that subfolder but not that of the parent folder.
And if reverse sort is to be also supported, some careful thought is needed to make sure the newest date for a folder's contents is indeed what makes sense.

Anyway the use cases I see are:

• sort by size descending; for candidates of wasted space, look at the date to check if it might be obsolete
• sort by date ascending and have a look at the older items and their sizes