This is not information that is of general interest because it constantly changes as files are updated. Thus, the df command does not accurately reflect the size of the clone fileset. If so, the original data may need to be saved in the clone. AdvFS determines this by examining the status of the clone's metadata. The file was created after the clone was created and is not part of the clone fileset.
Nothing is done to the clone fileset.
Metadata exists and the data has been marked as saved. This is not the first update to this page of the file. Nothing is done to the clone fileset. Metadata exists but this page has not been marked as saved. This is the first change to this page of the file.