Are there now available any TrueCrypt-like mountable encrypted filesystems for Android? Last I checked it seemed like it wasn't possible, but that was several years ago.

Even today it seems like there are many apps available that claim to keep photos, docs, etc., safe from prying eyes. But this seems to be accomplished just by putting the files into a location that's hidden from the standard apps, and requiring a password to run the one app that knows where to look. So, useless against something that captures the whole filesystem.