The ETag contains a value that you can use to perform operations conditionally. If the request service version is 2011-08-18 or newer, the ETag value will be in quotes.

Returns the date and time the file system or path was last modified. Any operation that modifies the file system or path, including an update of the its metadata or properties, changes the last-modified time of the filesystem or path..

Uniquely identifies a file system's or path's lease.

Gets the approximate time remaining in the lease period, in seconds. This is only provided when breaking a lease.