Same here. Trying to install Bootcamp on High Sierra but the shrinking fails.
mbp:~ alexander$ diskutil apfs resizeContainer disk1 300GB
Started APFS operation
Resizing APFS Container designated by APFS Container Reference disk1
Verifying storage system
Using live mode
Performing fsck_apfs -n -x -l /dev/disk0s2
Checking volume
Checking the container superblock
Checking the EFI jumpstart record
Checking the space manager
Checking the object map
Checking the APFS volume superblock
Checking the object map
Checking the fsroot tree
Checking the snapshot metadata tree
Checking the extent ref tree
Checking the snapshots
Checking snapshot 1 of 6
Checking snapshot 2 of 6
Checking snapshot 3 of 6
Checking snapshot 4 of 6
Checking snapshot 5 of 6
Checking snapshot 6 of 6
Checking the APFS volume superblock
Checking the object map
Checking the fsroot tree
Checking the snapshot metadata tree
Checking the extent ref tree
Checking the snapshots
Checking the APFS volume superblock
Checking the object map
Checking the fsroot tree
Checking the snapshot metadata tree
Checking the extent ref tree
Checking the snapshots
Checking the APFS volume superblock
Checking the object map
Checking the fsroot tree
Checking the snapshot metadata tree
Checking the extent ref tree
Checking the snapshots
Verifying allocated space
The volume /dev/disk0s2 appears to be OK
Storage system check exit code is 0
Shrinking APFS Physical Store disk0s2 from 499.418.034.176 to 299.999.997.952 bytes
Shrinking APFS data structures
APFS Container Resize error code is 49153
Error: -69606: A problem occurred while resizing APFS Container structures