Now that Mjolnir has been broken by Hela, do the shards still contain the enchantment placed on it?
For example, only someone who is worthy can pick up a shard of Mjolnir.
The shards of Mjolnir as shown in Thor: Ragnarok have not been recovered or followed up on, either in theatrical films, short films, or tie-in comics.
In Marvel Comics, Simon "Puddlegulp" Walterson (a man that a witch turned into a frog) recovered a sliver of Mjolnir and became…
Throg, Frog of Thunder, and wielder of the mighty Frogjolnir!
Source: Lockjaw and the Pet Avengers #1
"His only defense was a small metal sliver chipped from Thor's hammer. […]
"When he fell, the sliver struck the ground…and that that tiny frog was instantly transformed. […]
"He had the power of the god of thunder, as well as his hammer.
As we can clearly see, the sliver of Mjolnir transforms into a miniature version of the larger hammer with the same enchantment and same inscription.