Whether to force a rescan of the content. Otherwise a cached result will be used if available
optional #GCancellable object, %NULL to ignore
a %NULL-terminated array of content types or %NULL on error. Caller should free this array with g_strfreev() when done with it.
GException on failure.
2.18
Tries to guess the type of content stored on @mount. Returns one or more textual identifiers of well-known content types (typically prefixed with "x-content/"), e.g. x-content/image-dcf for camera memory cards. See the shared-mime-info
specification for more on x-content types.
This is an synchronous operation and as such may block doing IO; see g_mount_guess_content_type() for the asynchronous version.