Duplicity: How to list versions of a file?

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http://serverfault.com – Using Duplicity I can make an incremental, efficient backup to an untrusted remote storage. This works fine and I can restore files at a specific point in time (or the next backup after that). Well now I want to know when in the history of all the backups did a specific file change. File change timestamp and size along with the backup timestamps would be sufficient. Any way to do that with duplicity? (HowTos)