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 glib.global.strfreev when done with it.
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 a synchronous operation and as such may block doing IO; see gio.mount.Mount.guessContentType for the asynchronous version.