Hide Share extension from UIActivityViewController when user selects a directory

I'm looking to hide my app extension from the UIActivityViewController when a user selects a directory.

I have tried through specifying the dictionary on NSExtensionActivationRule with the available keys, but it seems that there is no key that considers directories:

NSExtensionActivationSupportsAttachmentsWithMaxCount
NSExtensionActivationSupportsAttachmentsWithMinCount
NSExtensionActivationSupportsFileWithMaxCount
NSExtensionActivationSupportsImageWithMaxCount
NSExtensionActivationSupportsMovieWithMaxCount
NSExtensionActivationSupportsText
NSExtensionActivationSupportsWebURLWithMaxCount
NSExtensionActivationSupportsWebPageWithMaxCount

As an alternative I'm using the string option, providing the following predicate that considers up to 5 files, 5 images, 1 video and 0 directories:

SUBQUERY (
    extensionItems,
    $extensionItem,
    SUBQUERY (
        $extensionItem.attachments,
        $attachment,
        ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.movie"
    ).@count <= 1
    AND
    SUBQUERY (
        $extensionItem.attachments,
        $attachment,
        ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image"
    ).@count <= 5
    AND
    SUBQUERY (
        $extensionItem.attachments,
        $attachment,
        ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.file-url"
    ).@count <= 5
    AND
    SUBQUERY (
        $extensionItem.attachments,
        $attachment,
        ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.directory"
    ).@count == 0
).@count >= 0

The predicate works for the video, image and file limitations, but when it comes to directories, the extension keeps appearing.

Is there any way to achieve this?